Individual study: Impact of pig slurry on soil properties, water salinization, nitrate leaching and crop yield in a four-year experiment in Central Spain
Díez J.A., Hernaiz P., Muñoz M.J., de la Torre A. & Vallejo A. (2004) Impact of pig slurry on soil properties, water salinization, nitrate leaching and crop yield in a four-year experiment in Central Spain. Soil Use and Management, 20, 444-450
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Amend the soil with manures and agricultural composts
A controlled, replicated experiment in 1998-2001 on sandy loam in Madrid, Spain (Díez et al. 2004) found the highest nitrate leaching from soil under excessive pig slurry (329 kg N/ha), followed by medium (215 kg N/ha) and low application (173 kg N/ha), compared to the control (78 kg/ha). Dissolved salts in the soil were higher under high (6,058 kg salts/ha) compared to medium application (2,019 kg salts/ha). Maize Zea mays grain yield was higher under high (11,961 kg/ha), medium (10, 984 kg/ha) and low application (10,797 kg/ha) compared to the control (9,363 kg/ha). Four slurry treatments were applied to a maize crop: control (no fertilizer), suboptimal/low (as urea), optimal/medium (170, 162 and 176 kg N/ha for 1998, 1999 and 2001), and excessive/high application (not specified). Slurry was applied to soil through a band spreader connected to a tanker and then incorporated into the soil by rotivation. There were three replicates of 9.9 x 11.1 m plots. Barley Hordeum vulgare was grown in 2000 to avoid excessive repeat-cropping with wheat, but results of that year were not reported in the study. Soils were sampled 33 times throughout the experiment using ceramic cups.